Computer Fan running loud

My Dell Dimension fan is running loud, since the temperture in my room is really hot, it must be picking it up. Anyways I took the side off, and put a box under it, that is 8 inches high. Now that the side is off it is running really quiet.

My question is since it is open on the side, could the static electrity from the carpet cause damage? Does it need to be higher than 8 inches up?

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